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  Home > JCE Print > Journal of Chemical Education > Issues > 2001  > June  >
Research: Science and Education
Evolution of a Chemical System as a Trajectory in a Phase Space. A Fruitful Picture of the Second Law
Ludovic Jullien
Département de Chimie, Ecole Normale Supérieure, 24, rue Lhomond, F-75231 Paris 05, France

Hervé Lemarchand
Laboratoire de Physique Théorique des Liquides, Université Pierre et Marie Curie, 4, place Jussieu, F-75252 Paris 05, France

Cover
June 2001
Vol. 78 No. 6
p. 803
Abstract
Two simple examples are presented for introducing the general phase space of a dynamic system as a tool for picturing the evolution of chemical systems. In such a state space, the family of equilibrium states, referred as the equilibrium manifold, is completely determined through the second law of thermodynamics. Any system evolution is displayed as a trajectory belonging to a constraint manifold depending on the applied external constraints. In general, the final state of evolution is the intersection between the constraint and the equilibrium manifolds.
More Information
*  Citation
 Jullien, Ludovic; Lemarchand, Hervé. J. Chem. Educ. 2001 78 803.
*  Keywords
 Physical Chemistry; Theoretical Chemistry; Thermodynamics
*  History
 Created:
Last Updated:		 May 8, 2001
August 31, 2005
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